this one has current mode of LIST:

### HLL SKETCH SUMMARY: 
  Log Config K   : 12
  Hll Target     : HLL_4
  Current Mode   : LIST
  Memory         : false
  LB             : 1.0
  Estimate       : 1.0
  UB             : 1.000049929250618
  OutOfOrder Flag: false
  Coupon Count   : 1

and the only example I've found has current mode

HLL

https://datasketches.apache.org/docs/HLL/HllJavaExample.html

it starts with a list of hashes, then moves to a hash set once there are … not many. finally it moves to HLL mode when the memory of storing the set would exceed the HLL array size

memory is whether it’s an on-heap object or lives in “off-heap” memory outside the reach of the JVM’s garbage collector

false = regular object

and out of order impacts the estimation algorithm. there’s a better estimator you can use, but it requires having seen all the data in a single stream. that means it doesn’t work if you’ve merged sketches in HLL mode since you’ve mixed the order of arrival of events in the merge process.

but what exactly is the issue? a sketch in HLL mode will not necessarily change on every update